<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=Edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link rel="stylesheet" href="./index.ico">
    <title>Document</title>
    <style>
      * {
        margin: 0;
        padding: 0;
      }

      .root {
        width: 600px;
        margin: auto;
        text-align: center;
        /* border: 1px solid gray; */
      }

      .logo {
        float: left;
        width: 100px;
        background-color: green;
      }

      .banner1 {
        float: left;
        width: 350px;
        background-color: aqua;
        margin: auto;
      }

      .banner2 {
        float: right;
        width: 100px;
        background-color: blueviolet;
      }

      .clearfix::after {
        content: "";
        display: block;
        clear: both;
      }

      .menu {
        margin: 5px 0 5px 0;
        background-color: brown;
      }

      .left {
        width: 225px;
        float: left;
      }

      .center {
        width: 225px;
        float: left;
        margin: 0 25px 0 25px;
      }

      .right {
        width: 100px;
        float: right;
      }

      .lanmu1 {
        border: 1px solid grey;
        width: 223px;
        height: 150px;

      }

      .lanmu2 {
        border: 1px solid grey;
        width: 105px;
        height: 150px;
        float: left;
        margin-top: 5px;

      }

      .lanmu3 {
        border: 1px solid grey;
        width: 105px;
        height: 150px;
        float: right;
        margin-top: 5px;
      }

      .right1, .right2, .right3 {
        height: 97.6px;
        border: 1px solid grey;
      }

      .right2, .right3 {
        margin-top: 5px;
      }

      .footer {
        background-color: grey;
        height: 30px;
        margin-top: 5px;
      }

      

    </style>
</head>
<body>
    <div class="root">
      <div class="header clearfix">
        <div class="logo">logo</div>
        <div class="banner1">banner1</div>
        <div class="banner2">banner2</div>
      </div>
      <div class="menu">菜单</div>
      <div class="content clearfix">
        <div class="left clearfix">
          <div class="lanmu1">lanmu1</div>
          <div class="lanmu2">lanmu3</div>
          <div class="lanmu3">lanmu4</div>
        </div>
        <div class="center clearfix">
          <div class="lanmu1">lanmu1</div>
          <div class="lanmu2">lanmu3</div>
          <div class="lanmu3">lanmu4</div>
        </div>
        <div class="right clearfix">
          <div class="right1">lanmu1</div>
          <div class="right2">lanmu3</div>
          <div class="right3">lanmu4</div>
        </div>
      </div>
      <div class="footer">footer</div>
    </div>
</body>
<script>

</script>
</html>